One Piece Simple Direct Drive Extruder
by Tobeca, published
Very compact, only 50x42x20mm !! Only one simple piece to print for the whole extruder !!
This is a very simple extruder for NEMA17 motors. Designed for 3mm filament. I think a PTFE pipe to adapt 1.75mm is possible.
You just need a brass insert (Like Adrian Geared Extruder) and a 608ZZ bearing (+ screw and nut).
No springs, you have to adjust the pressure at the mounting of the motor.
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18/01/2013 : Tested with filament but not on printing. 18/01/2013 : new version, I've centered the exit hole for the hotend. 21/01/2013 : modification of the space for the brass insert, not wide enough 22/01/2013 : new picture of mounted extruder. Tested for extrusion, it seems to works well ! 24/01/2012 : new design to have more access to the filament.
How to use :
I use this type of extruder : http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=281052150425#ht_5325wt_1399 It has 30 mm between the 2 M3 screws. So the extruder is design to use the screws of the hotend to get fixed through a carriage.
You need to setup the hotend and the extruder before mounting the motor.
Then, adjust the motor position to grab the filament well (you will have to make some extrusion tests to find the right position). When it's correct, tighten the 2 M3 motors screws.